CN113151836A - Corrosion inhibitor suitable for hot-rolled pickled steel, preparation method and application - Google Patents
Corrosion inhibitor suitable for hot-rolled pickled steel, preparation method and application Download PDFInfo
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- CN113151836A CN113151836A CN202110262606.2A CN202110262606A CN113151836A CN 113151836 A CN113151836 A CN 113151836A CN 202110262606 A CN202110262606 A CN 202110262606A CN 113151836 A CN113151836 A CN 113151836A
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- corrosion inhibitor
- hot
- pickled steel
- rolled pickled
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/068—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors compounds containing a C=C bond
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Abstract
The invention discloses a corrosion inhibitor suitable for hot-rolled pickled steel, a preparation method and application thereof, wherein 3-anilino-1-phenyl acetone and dicyandiamide solution are uniformly mixed in a reaction vessel, an acid catalyst is added, and an intermediate is formed by high-temperature reaction; then adding a surfactant into the reaction container, and reacting under stirring at normal temperature to form the corrosion inhibitor; the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide solution is 1: 0.7-1: 1.5, and the molar ratio of the intermediate to the surfactant is 1: 1-1: 2. The corrosion inhibitor has low consumption and good corrosion inhibition effect, and the corrosion inhibition rate can reach more than 98 percent; the corrosion inhibitor is simple to synthesize, the surface quality of the pickled steel plate is improved, the problems of blackening and color difference of the hot-rolled pickled plate which is cold replaced by hot plate after pickling can be obviously solved, the surface of the pickled steel strip is uniform and bright white, and the pickling process is favorable for subsequent processes and customers.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a corrosion inhibitor suitable for hot-rolled pickled steel, a preparation method and application.
Background
The hot-rolled pickled steel is an intermediate product between a hot-rolled plate and a cold-rolled plate, the quality requirement of the hot-rolled pickled steel is higher than that of the hot-rolled plate, and part of the hot-rolled pickled steel even needs to be produced according to the quality requirement of the cold-rolled plate. Compared with the common hot rolled plate, the hot-rolled pickled plate removes the iron oxide scales on the surface, improves the surface quality, and is convenient for welding, oiling, electrophoresis and paint spraying. The hot-rolled pickled plate is used for replacing a corresponding cold-rolled plate, so that the production cost of an enterprise can be saved. At present, hot-rolled pickled steel mainly comprises cold-forming steel, structural steel, automobile structural steel, enamel steel and the like, and is widely applied to the industry fields of automobiles, compressors, general-purpose machines and the like.
The oxidation of the surface of the hot-rolled pickled plate needs to be pickled, but the pickling is usually carried out by adopting a cold-rolling production line, but the blackening and color difference defects of the pickled surface have great influence on hot-rolled pickled steel products which are cooled by heat, and the addition of the corrosion inhibitor into the acid is an effective means. The corrosion inhibitor is a chemical substance which is added in a small amount in a corrosion medium and can greatly reduce the corrosion rate of metal. However, the traditional corrosion inhibitor does not obviously improve the problems of blackening and color difference of the hot-rolled pickled plate after acid cleaning. Therefore, the development of the pickling corrosion inhibitor which has the advantages of small addition amount and high corrosion inhibition efficiency and can be suitable for the hot-rolled pickled plate is urgently needed.
Disclosure of Invention
The invention aims to provide the corrosion inhibitor which is low in addition amount, high in corrosion inhibition efficiency and low in cost and is suitable for hot-rolled pickled steel, the preparation method and the application, and meanwhile, the problems of blackening and color difference of hot-cold-replaced hot-rolled pickled plates after pickling can be obviously improved, so that the surfaces of pickled strip steel are uniform and bright white.
In order to achieve the purpose, the preparation method of the corrosion inhibitor suitable for the hot-rolled pickled steel, which is designed by the invention, comprises the following steps:
uniformly mixing 3-anilino-1-phenyl acetone and a dicyandiamide solution in a reaction vessel, adding an acid catalyst, and reacting at high temperature to form an intermediate; then adding a surfactant into the reaction container, and reacting under stirring at normal temperature to form the corrosion inhibitor;
wherein the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide solution is 1: 0.7-1: 1.5, and the molar ratio of the intermediate to the surfactant is 1: 1-1: 2.
Further, reacting at high temperature for 2-4 hours.
Further, the acidic catalyst is concentrated sulfuric acid, perchloric acid or tetrafluoroboric acid.
Further, the surfactant is polyoxyethylene nonylphenol ether.
Further, stirring and reacting for 3-5 hours at normal temperature to form the corrosion inhibitor.
Also provides a corrosion inhibitor suitable for hot-rolled pickled steel, which is prepared by the preparation method.
And finally, providing an application of the corrosion inhibitor suitable for the hot-rolled pickled steel, wherein the corrosion inhibitor is used in the pickling process of the hot-rolled pickled steel, a cold-rolling pickling line is adopted, the pickling temperature is 70-80 ℃, the pickling speed is 40-120 m/min, and the addition amount of the corrosion inhibitor is 0.03-0.06% of the total amount of acid used for pickling.
The 3-anilino-1-phenyl acetone is a compound with a heterocyclic ring, forms a positive ion active group in acid liquor, can form a monomolecular adsorption film on the surface of metal, changes the oxidation-reduction potential of hydrogen ions, makes the hydrogen ions difficult to approach the surface of the metal, and is compounded with dicyandiamide to form a coordination bond, so that the overlapping adsorption capacity is increased; and transverse attraction exists among the adsorption particles, so that the adsorption layer is compact and has good stability.
Compared with the prior art, the invention has the following beneficial effects:
1) the corrosion inhibitor has low consumption and good corrosion inhibition effect, and the corrosion inhibition rate can reach more than 98 percent;
2) the corrosion inhibitor disclosed by the invention is simple to synthesize, the surface quality of the pickled steel plate is improved, the problems of blackening and color difference of a hot-rolled pickled plate which is cold replaced by hot-pickled plate after pickling can be obviously solved, the surface of the pickled steel plate is uniform and bright white, and the pickling process is favorable for subsequent processes and customers to use.
Drawings
Figure 1 is a graph comparing whiteness measurements.
Detailed Description
The present invention will be described in further detail with reference to specific examples and comparative examples to facilitate a clearer understanding of the present invention, but the present invention is not limited thereto.
Example 1
Adding 3-anilino-1-phenyl acetone and dicyandiamide into a flask, uniformly mixing, adding an acidic catalyst, reacting at high temperature for 2 hours to generate a condensation reaction to form an intermediate, then adding polyoxyethylene nonyl phenol ether, stirring at normal temperature for 3 hours, wherein the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide is 1:0.7, the molar ratio of the intermediate to the polyoxyethylene nonyl phenol ether is 1:1, and finally distilling to remove the solvent to obtain the corrosion inhibitor.
Example 2
Adding 3-anilino-1-phenyl acetone and dicyandiamide into a flask, uniformly mixing, adding an acidic catalyst, reacting at high temperature for 3 hours to generate a condensation reaction to form an intermediate, then adding polyoxyethylene nonyl phenol ether, stirring at normal temperature for 4 hours, wherein the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide is 1:1, the molar ratio of the intermediate to the polyoxyethylene nonyl phenol ether is 1:1.5, and finally distilling to remove the solvent to obtain the corrosion inhibitor.
Example 3
Adding 3-anilino-1-phenyl acetone and dicyandiamide into a flask, uniformly mixing, adding an acidic catalyst, reacting at high temperature for 4 hours to generate a condensation reaction to form an intermediate, then adding polyoxyethylene nonyl phenol ether, stirring at normal temperature for 5 hours, wherein the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide is 1:1.5, the molar ratio of the intermediate to the polyoxyethylene nonyl phenol ether is 1:2, and finally distilling to remove the solvent to obtain the corrosion inhibitor.
Example 4
Adding 3-anilino-1-phenyl acetone and dicyandiamide into a flask, uniformly mixing, adding acid emerald, reacting at high temperature for 2 hours to generate a condensation reaction to form an intermediate, then adding polyoxyethylene nonyl phenol ether, stirring at normal temperature for 5 hours, wherein the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide is 1:1.2, the molar ratio of the intermediate to the polyoxyethylene nonyl phenol ether is 1:1.2, and finally distilling to remove the solvent to obtain the corrosion inhibitor.
Example 5
Adding 3-anilino-1-phenyl acetone and dicyandiamide into a flask, uniformly mixing, adding an acidic catalyst, reacting at high temperature for 4 hours to generate a condensation reaction to form an intermediate, then adding polyoxyethylene nonyl phenol ether, stirring at normal temperature for 3 hours, wherein the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide is 1:0.7, the molar ratio of the intermediate to the polyoxyethylene nonyl phenol ether is 1:2, and finally distilling to remove the solvent to obtain the corrosion inhibitor.
The corrosion inhibition performance of the corrosion inhibitor prepared by the invention and suitable for hot-rolled pickled steel is evaluated by comparing the surface whiteness. The picture and the whiteness measurement value are shown in figure 1, when the corrosion inhibitor is not added into two hot-rolled pickled steels, the pickled surfaces are black and uneven in color, the whiteness value is low, and after the corrosion inhibitor with the mass fraction of 0.05% is added, the surface color difference is obviously reduced after pickling, and the whiteness is obviously improved. The invention has the advantages of low consumption, good corrosion inhibition effect and high corrosion inhibition rate up to more than 98%.
Claims (7)
1. A preparation method of a corrosion inhibitor suitable for hot-rolled pickled steel is characterized by comprising the following steps: the preparation method comprises the following steps:
uniformly mixing 3-anilino-1-phenyl acetone and a dicyandiamide solution in a reaction vessel, adding an acid catalyst, and reacting at high temperature to form an intermediate; then adding a surfactant into the reaction container, and reacting under stirring at normal temperature to form the corrosion inhibitor;
wherein the molar ratio of the 3-anilino-1-phenyl acetone to the dicyandiamide solution is 1: 0.7-1: 1.5, and the molar ratio of the intermediate to the surfactant is 1: 1-1: 2.
2. The method of preparing a corrosion inhibitor suitable for hot-rolled pickled steel according to claim 1, characterized in that: and carrying out high-temperature reaction for 2-4 hours.
3. The method of preparing a corrosion inhibitor suitable for hot-rolled pickled steel according to claim 1, characterized in that: the acidic catalyst is concentrated sulfuric acid, perchloric acid or tetrafluoroboric acid.
4. The method of preparing a corrosion inhibitor suitable for hot-rolled pickled steel according to claim 1, characterized in that: the surfactant is polyoxyethylene nonyl phenol ether.
5. The method of preparing a corrosion inhibitor suitable for hot-rolled pickled steel according to claim 1, characterized in that: and stirring and reacting for 3-5 hours at normal temperature to form the corrosion inhibitor.
6. A corrosion inhibitor suitable for hot-rolled pickled steel is characterized in that: the corrosion inhibitor is prepared by the preparation method shown in claim 1.
7. The application of the corrosion inhibitor suitable for the hot-rolled pickled steel is characterized in that: the corrosion inhibitor of claim 6 is used in the pickling process of hot-rolled pickled steel, a cold-rolling pickling line is adopted, the pickling temperature is 70-80 ℃, the pickling speed is 40-120 m/min, and the addition amount of the corrosion inhibitor is 0.03-0.06% of the total amount of acid used for pickling.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0357217A2 (en) * | 1988-08-01 | 1990-03-07 | Exxon Chemical Patents Inc. | Ethylene alpha-olefin copolymer substituted amino phenol mannich base lubricant dispersant additives |
| CN102154654A (en) * | 2011-05-10 | 2011-08-17 | 浙江爱迪亚营养科技开发有限公司 | Acid washing corrosion inhibitor |
| CN104231800A (en) * | 2014-08-22 | 2014-12-24 | 青岛保利康新材料有限公司 | Durable antirust coating |
| CH709580A2 (en) * | 2014-04-21 | 2015-10-30 | Wieland Kg | Corrosion inhibitors, improved color and anti-corrosive coating. |
| CN106752694A (en) * | 2016-12-07 | 2017-05-31 | 中国京冶工程技术有限公司 | A kind of Industrial Heritage steel construction basic unit protective agent and its preparation method and application |
| CN107418549A (en) * | 2017-08-29 | 2017-12-01 | 中国石油集团渤海钻探工程有限公司 | A kind of compound acidification corrosion inhibitor of 120 ~ 140 DEG C of heatproof |
| CN111575465A (en) * | 2020-05-13 | 2020-08-25 | 武汉钢铁有限公司 | Production method for preventing surface of hot-rolled pickled steel from blackening |
-
2021
- 2021-03-10 CN CN202110262606.2A patent/CN113151836B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0357217A2 (en) * | 1988-08-01 | 1990-03-07 | Exxon Chemical Patents Inc. | Ethylene alpha-olefin copolymer substituted amino phenol mannich base lubricant dispersant additives |
| CN102154654A (en) * | 2011-05-10 | 2011-08-17 | 浙江爱迪亚营养科技开发有限公司 | Acid washing corrosion inhibitor |
| CH709580A2 (en) * | 2014-04-21 | 2015-10-30 | Wieland Kg | Corrosion inhibitors, improved color and anti-corrosive coating. |
| CN104231800A (en) * | 2014-08-22 | 2014-12-24 | 青岛保利康新材料有限公司 | Durable antirust coating |
| CN106752694A (en) * | 2016-12-07 | 2017-05-31 | 中国京冶工程技术有限公司 | A kind of Industrial Heritage steel construction basic unit protective agent and its preparation method and application |
| CN107418549A (en) * | 2017-08-29 | 2017-12-01 | 中国石油集团渤海钻探工程有限公司 | A kind of compound acidification corrosion inhibitor of 120 ~ 140 DEG C of heatproof |
| CN111575465A (en) * | 2020-05-13 | 2020-08-25 | 武汉钢铁有限公司 | Production method for preventing surface of hot-rolled pickled steel from blackening |
Non-Patent Citations (1)
| Title |
|---|
| 范金福等: ""曼尼希碱类缓蚀剂的合成及研究进展"", 《山东化工》, vol. 46, 31 December 2017 (2017-12-31), pages 2 * |
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